32 DINOCERATA. 



The Vomers. 



TliH vomers in the Dinoccrata do not ai)pear upon the surface of the 

 pahite. They are narrow bones, closely united, and deei)ly concave upon 

 tlieir upper surface. They are wedged in between tlie palatine plates of 

 the maxillaries, and in old animals are closely united with them. 



The groove formed by the u])per concave surfaces of the vomers is 

 hlled by the turbinal bones, which are well developed. 



The following are the principal dimensions of three of tlie skulls 

 described in the present chapter. ]\Ieasurements of others will be foinid 

 in the Synopsis at the end of the volume : 



Measurements of Skull. [Dinnci rax niu-dhlle, No. 1036.) 



m. 



Total length of skull from nasals to occipital crest, _ _ . _ . - . 0. 76 



Total length, from premaxillai-ies to occipital condyles, 0.66 



Greatest transverse diameter, through parietal protuberancca, _ 0.385 



Greatest transverse diameter, through occipital crest, 0.26 



Greatest transverse diameter, through maxillary protuberances, 0.20.5 



Least transverse diameter, behind maxillary protuberances, 0.1.35 



Greatest transverse diameter, through zygomatic arches, 0.285 



(Greatest transverse diameter, through post-glenoid processes, 0.25 



Length of palate, from end of premaxillaries to posterior narcs, 0.35 



Length of palatine bone, on median line, ...... - - - 0.030 



Length of maxillary bone, on median line, 0. 1 S-'> 



Width of palate, between last molars, 0.050 



Width of palate, between first molars, O.OG-j 



Width of palate, between first premolars, . - 0.050 



Width of palate, across diastema, -- 0.07 



Width of palate, between canines, .-. 0.105 



Antero-posterior diameter of zygomatic fossa, . — 0.165 



Transverse diameter of zygomatic fossa, — <'.08 



Distance from top of parietal protuberance to end of post glenoid process,.. _ 0.37 



Distance from top of maxillary protuberance to end of canine, 0.4 1 5 



Vertical diameter of foramen magnum, ... 0.05 1 



Transverse diameter of foramen magnum, 0.066 



